Spindles are made from billet alum. to keep the hot rod lightweight and anodized for wear resistance. Short spindle measures 1.660" end to end, from bearing surface to mounting surface 1.100", long spindle 2.165" end to end, from bearing surface to mounting surface 1.600" and both are set up for a .750" stud or bolt.
Spindles are recommended to be used with idler pulley #1510-0002, 1510-0009, 1510-0009A, 1510-0010 or 1510-0011.